| 摘要 |
<p>AE 3475 An improved process for the preparation of a catalyst for the polymerization of ethylene, and an improved process for preparing an ethylene polymer therewith. An improved catalyst is prepared by mixing an aluminium halide and a magnesium compound at a temperature below 100 .degree.C and in the absence of monomer(s), their ratio being such that the molar ratio between halogen and magnesium is from 2 : 1 to 20 : 1, mixing an alcohol with the mixture of the aluminium halide and the magnesium compound, this also being effected at below 100 .degree.C and in the absence of monomer(s), the amounts used being such that the molar ratio between alcohol and hydrocarbyl groups bound to magnesium and aluminium is from 0.1 to 0.9, and by adding after mixing of the aluminium compound and the magnesium compound and before, simultaneously with or after combining with the alcohol, a titanium compound, the amounts added being such that the molar ratio between magnesium and titanium is from 2 : 1 to 200 : 1. The improved polymerization process is carried out at at least 180 .degree.C.</p> |
